Researchers have developed a tougher, longer-lasting road material from an unexpected source: algae. Oils derived from microscopic algae could replace part of the petroleum-based binder used in asphalt, making paved surfaces more flexible, durable, and greener.

Conventional pavement relies on bitumen, a crude oil-based material that binds sand and rocks together. While bitumen allows roads to expand in heat and contract in cold, it becomes brittle when temperatures plunge, leading to cracks that spread under traffic and moisture.